I wanted to build a bumper and needed a light that wasn't an add on bolted to the top of it. I found these and they are great! Perfect Flush mounting lights with tons of power.
The hole you would need to cut is a rectangle 3-1/4" x 3-3/8". The light itself is 3" deep. The overall dimensions are 4-7/8" x 3-5/8". These are an 8 degree Spot, 4W CREE LED's, 16w total, 1280 Lumen.
I will get some pics over the next week or so after I complete the bumper...
Flush Mount LED Bumper Light - RuffStuff Specialties